我正在研究小型Raspberry PI群集,我的主机程序创建IP数据包片段并将其发送到多个中继程序。中继接收这些数据包片段,然后使用原始套接字将其转发到目的地。由于存在原始套接字,因此我的中继程序必须以sudo权限运行。我的设置涉及RPi 3 B v2和RPi 2 B v1。 SSH已经设置好了,尽管我必须在每个节点上运行ssh-agent并ssh-add我的密钥,但是节点可以不使用密码进行SSH输入。我设法运行程序从一个节点到另一个节点(2个不同的RPis)发送等级。我只以MPMD方式运行MPI程序,因为我只有2个RPis,所以我在节点#1上运行主机和中继,在节点#2上运行中继。主机程序采用文件的路径作为命令行参数发送。
如果我跑步:
mpirun --oversubscribe -n 1 --host localhost /home/pi/Desktop/host /some.jpeg : -n 2 --host localhost,rpi2 /home/pi/Desktop/relay
它可以运行,但是显然程序会失败,因为没有sudo权限,中继无法打开原始套接字。
如果我跑步:
mpirun --oversubscribe -n 1 --host localhost /home/pi/Desktop/host /some.jpeg : -n 2 --host localhost,rpi2 sudo /home/pi/Desktop/relay
中继报告的世界大小:1,并且主机程序挂起。
如果我跑步:
mpirun --oversubscribe -n 1 --host localhost sudo /home/pi/Desktop/host /some.jpeg : -n 2 --host localhost,rpi2 sudo /home/pi/Desktop/relay
所有中继和主机报告的世界大小为1。
我在这里发现了类似的问题:OpenMPI / mpirun or mpiexec with sudo permission
以下是我的简短回答:
mpirun --oversubscribe -n 1 --host localhost /home/pi/Desktop/host /some.jpeg : -n 2 --host localhost,rpi2 sudo -E /home/pi/Desktop/relay
结果:
[raspberrypi:00979] OPAL ERROR: Unreachable in file ext2x_client.c at line 109
[raspberrypi:00980] OPAL ERROR: Unreachable in file ext2x_client.c at line 109
*** An error occurred in MPI_Init
*** An error occurred in MPI_Init
*** on a NULL communicator
*** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
*** and potentially your MPI job)
[raspberrypi:00979] Local abort before MPI_INIT completed completed successfully, but am not able to aggregate error messages, and not able to guarantee that all other processes were killed!
*** on a NULL communicator
*** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
*** and potentially your MPI job)
[raspberrypi:00980] Local abort before MPI_INIT completed completed successfully, but am not able to aggregate error messages, and not able to guarantee that all other processes were killed!
--------------------------------------------------------------------------
Primary job terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun detected that one or more processes exited with non-zero status, thus causing
the job to be terminated. The first process to do so was:
Process name: [[32582,1],1]
Exit code: 1
--------------------------------------------------------------------------
我已经运行sudo visudo,并且两个节点上的文件都像这样:
# User privilege specification
root ALL=(ALL:ALL) ALL
pi ALL = NOPASSWD:SETENV: /etc/alternatives/mpirun
pi ALL=NOPASSWD:SETENV: /usr/bin/orterun
pi ALL=NOPASSWD:SETENV: /usr/bin/mpirun
当我在一个节点上运行所有内容时,它就可以工作:
sudo mpirun --alow-run-as-root --oversubscribe -n 1 --host localhost /home/pi/Desktop/host /some.jpeg : -n 2 --host localhost,localhost /home/pi/Desktop/relay
//主机
int main(int argc, char *argv[]) {
MPI_Init(&argc, &argv);
int world_size = []() {
int size;
MPI_Comm_size(MPI_COMM_WORLD, &size);
return size;
}();
int id = []() {
int id;
MPI_Comm_rank(MPI_COMM_WORLD, &id);
return id;
}();
if (argc != 2) {
std::cerr << "Filepath not passed\n";
MPI_Finalize();
return 0;
}
const std::filesystem::path filepath(argv[1]);
if (not std::filesystem::exists(filepath)) {
std::cerr << "File doesn't exist\n";
MPI_Finalize();
return 0;
}
std::cout << "World size: " << world_size << '\n';
MPI_Finalize();
return 0;
}
//relay
int main(int argc, char *argv[]) {
MPI_Init(&argc, &argv);
int world_size = []() {
int size;
MPI_Comm_size(MPI_COMM_WORLD, &size);
return size;
}();
int id = []() {
int id;
MPI_Comm_rank(MPI_COMM_WORLD, &id);
return id;
}();
std::cout << "World size: " << world_size << '\n';
MPI_Finalize();
return 0;
}
如何配置节点以允许它们使用sudo运行MPI程序?
答案 0 :(得分:0)
解决问题的最简单方法是设置文件的功能,它仍然带来安全性问题,但是不像将程序的suid设置为root那样严重。要设置允许打开原始套接字的程序功能:setcap program cap_net_raw,cap_net_admin+eip
。